Precise linear fastener system and method for use
The present invention provides a linear fastening system capable of rapid engagement and disengagement. More specifically, the system utilizes a cooperating collet member and a compression ring member which are constructed and arranged to slip easily over a shank member. The fastener system is secured by linearly traversing a compression member in an overlapping fashion over the collet member thereby utilizing ribbed surfaces to compress the collet member to grip the outer surface of the shank member. In this manner, the linear fastener system is capable of providing a precise, secure, and reproducible connection between multiple components without the need to apply rotational torque to the assembly.
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This application is related to patent application Ser. No. 10/661,371, filed Sep. 10, 2003, the contents of which are herein incorporated by reference in their entirety. This application is also related to patent application Ser. No. 10/358,427, filed Feb. 4, 2003, the contents of which are herein incorporated by reference in their entirety.
FIELD OF THE INVENTIONThe present invention relates to fasteners capable of rapid linear engagement and disengagement. More specifically, the system utilizes a combination of interlocking sleeve members which combine to form a versatile and effective fastener system which may be used to connect components together without placing torque on the assembly.
BACKGROUND OF THE INVENTIONIn general, a fastener is any device used to connect or join two or more components to create an assembly. In the field of manufacturing there are numerous assembly processes requiring individual components to be joined with fasteners to create an assembled product. Most of these processes, requiring fixations of one component in relation to another are currently performed using threaded fasteners for connections. The most common threaded fasteners are referred to by many names, among them: bolts, screws, nuts, studs, lag screws, and set screws.
Since the invention of the threaded fastener, and particularly the bolt and nut combination, various attempts aimed at improving the efficiency of assembling components with threaded fasteners have been made. For this reason, today's product designer has an extraordinary array of choices and possible permutations of known fastening concepts and features. Literally hundreds of types and variations of threaded fasteners are available. Because threaded fastener connections often have a significant impact on assembly cost and product reliability, a great deal of design effort is directed to more efficient designs. Fastener design effort typically involves compromises among considerations such as cost, size, reliability, performance, ease of manufacture, and retrofit capability to existing product designs. While some of these designs improve assembly efficiency, they often result in extremely complex, specialized and expensive fastening components.
In addition to the assembly costs associated with threaded fasteners, the rotational torque required for proper utilization of threaded fasteners is often undesired. When a bolt is used to clamp two parts, the force exerted between the parts is the clamping load. The clamping load is created by exerting a tightening torque on the nut or the head of the screw. These forces keep the threads of the mating parts in intimate contact and decrease the probability of the fastener loosening in service. These forces may damage delicate assemblies, such as electronics and the like. Lock washers, plastic inserts in the nut or bolt, adhesives, cotter pins, locking tabs, etc. are often used to reduce the torque required to prevent a nut and bolt combination from becoming loose during operation. While these devices are generally effective, they add cost and complexity to the assembly operation especially where automated equipment is utilized.
Accordingly, what is lacking in the prior art is a cost effective fastening system capable of linear engagement. The fastener system should achieve objectives such as providing improved manufacturing and assembly efficiency, effective reliable performance, corrosion resistance, and torque-less assembly. The system should include packaging flexibility for installation on various products including retrofitting existing product configurations with minimal modification of the original product.
DESCRIPTION OF THE PRIOR ARTA number of prior art threaded fastening systems exist for attaching components together to form an assembly. Most of the systems, for example bolts and nuts, utilize a combination of internally and externally threaded components to achieve the clamping forces necessary to create the desired assemblies.
It is also known in the prior art to provide various fasteners capable of partial linear and partial rotational engagement. These fasteners generally feature radially inwardly or outwardly biased arcuate segments mounted to engage the threads of a bolt, nut or other threaded member. The threaded segments are generally movably mounted within a casing or around a shaft and resiliently urged inwardly or outwardly. Typically the devices are provided with axially spaced apart radially inwardly directed surfaces of revolution, such as frustoconical surfaces, extending at a common acute angle to the axis of the fastener. In this manner the fasteners and couplings may be secured by merely pushing the threaded components together, thereafter final tightening is accomplished by rotation of the fasteners.
U.S. Pat. No. 5,788,443 to Cabahug discloses a male coupling device featuring movably mounted threaded members which are capable of rapid engagement and disengagement with respect to the stationary threads of a female coupling device. The male coupling device includes a handled shaft having a plurality of threaded segments surrounding the shaft, a sleeve is mounted to move relative to the handle to move the threaded segments inwardly and outwardly to effectively vary the diameter of the assembled threaded elements.
U.S. Pat. No. 5,613,816 to Cabahug discloses an apparatus for rapidly engaging and disengaging threaded coupling members. The complex device includes pin assemblies moveably fitted within adjacent V-shaped segments of the movably mounted externally threaded elements. The device is constructed such that as the coupling members are moved relative to one another the pin assemblies force the threaded elements apart. In addition, ball assemblies are required to maintain proper alignment and locking action of the threaded segments, further adding to the complexity of the device.
U.S. Pat. No. 5,800,108 to Cabahug discloses apparatus for rapidly engaging and disengaging threaded coupling members, which eliminates the ball assemblies of his prior disclosure. The device includes an outer body with a plurality of pull/lock/torque pins extending inwardly to cooperate with oval indentations and apertures extending along the side of the threaded segments. When the sleeve associated with the outer body is moved down, the pins abut the oval indentations to lock the threaded elements in place. As the sleeve is pulled upwardly the pull/lock/torque pins clear a ledge formed on the threaded segments allowing them to move. Continued pulling back of the sleeve allows the pins to pass through apertures and causes the threaded segments to engage a ramp to direct the segments back and away from the bolt member. The construction requires extremely tight machining tolerances to prevent the pins from deflecting to the side and preventing operation of the device. In addition, the amount of torque which can be applied to the threaded segments is limited to that which the pins and the oval indentations can withstand, limiting the device to light duty applications.
U.S. Pat. No. 4,378,187 to Fullerton discloses a quick acting nut assembly. The device consists of a multi-part nut casing having an inclined interior surface adapted for sliding engagement with a threaded jam nut which wedges therein. As the jam nut moves in a first direction along the inclined surface, it compresses radially and the threads of the jam nut engage the threads of the bolt. As the jam nut moves in a second direction along the inclined surface, it may expand radially and disengage from the bolt. When the jam nut is in the engaged position it may be tightened by conventional rotational motion. As the device is tightened the threaded segments increase pressure against the fastener making the task of torquing the fastener to a specified torque difficult. In addition, due to the size of the device, it requires additional space for wrench clearance and the like.
U.S. Pat. Nos. 5,324,150 and 5,427,488 to Fullerton disclose threaded fasteners having a casing that enclose at least three inwardly biased arcuate segments positioned to engage the threads of a bolt. The casing defines spaced apart frustoconical surfaces directed toward the fastener and positioned to engage corresponding surfaces of the segments when the fastener is turned in a first direction. The casing is also provided with a second frustoconical surface for urging the threaded arcuate segments away from the bolt when the fastener is turned in a second direction.
While the prior art devices allow partials linear engagement they require rotational torque to produce the clamping forces required to maintain assemblies. These devices also require extensive machining of thin sections and require difficult assembly processes for manufacture. This combination results in high production cost and weak finished components. Still further, it is well known in the art that cold forming manufacturing techniques result in much stronger and more reliable fasteners. The designs of the prior art devices do not lend themselves to traditional fastener manufacturing techniques, e.g. cold forming, thread rollers, pointers, nut tappers, slotters, shavers etc., adding to the high manufacturing cost and reducing the strength of the fasteners. The present invention teaches a linear fastener system that includes an inner collet member and an outer compressing member that is capable of rapid linear actuated engagement and/or disengagement. In addition, the present invention teaches a linear engaging fastener that is capable of applying precise clamping force to the assembled components without rotating the fastening members. Still further the present invention teaches a fastener system that lends itself to multiple manufacturing techniques.
SUMMARY OF THE INVENTIONThe present invention provides a linear fastening system capable of rapid linear engagement and disengagement. More specifically, the system utilizes a interlocking collet member and a compression ring member which are constructed and arranged to slip easily over a shank member while in a first release position. The collet member is constructed and arranged with an inner engaging surface and an outer ribbed compression surface, the compression ring member being constructed and arranged with an inner ribbed compression surface preferably conjugate in shape with respect to the outer surface of the collet member. The fastener system is secured by sliding the compression member in a linear overlapping fashion over the collet member, thereby utilizing the ribbed surfaces to compress the collet member and place a tensile load on the compression ring to grip the outer surface of the shank member. In this manner, the linear fastener system is capable of providing a precise, secure, and reproducible connection between multiple components without the need to apply rotational torque to the assembly. The connection also allows full thread engagement and a locking connection without the need for plastic inserts or adhesives. When compared to traditional threaded fasteners, the dual ribbed compression surfaces allow very precise tensile loads to be applied to the shank member. Prior art designs require torque wrenches to apply measured clamping loads to fasteners. Linear compression of the collet member eliminates variations as seen in the prior art due to surface finish, lubrication and thread engagement to achieve a precise clamping load.
Accordingly, it is an objective of the present invention to provide a fastener system capable of precisely and reproducibly securing multiple components into a single assembly without the need to apply-torque to the assembly.
An additional objective of the present invention is to provide a fastener system capable of precise and reproducible linear engagement and disengagement.
It is a further objective of the present invention to provide a fastener system capable of providing precise and reproducible linear engagement to externally threaded surfaces and the like.
A still further objective of the present invention is to provide a fastener system capable of providing precise and reproducible linear engagement to snap ring grooves and the like.
Another objective of the present invention is to provide a fastener system capable of providing precise and reproducible linear clamping forces to a shank member.
Yet another objective of the present invention is to provide a fastener system suited for automated manufacturing and assembly.
Still yet another objective of the present invention is to provide a fastener system that allows close spacing and does not require wrench clearances.
Other objects and advantages of this invention will become apparent from the following description taken in conjunction with the accompanying drawings wherein are set forth, by way of illustration and example, certain embodiments of this invention. The drawings constitute a part of this specification and include exemplary embodiments of the present invention and illustrate various objects and features thereof.
Although the invention is described in terms of a preferred specific embodiment, it will be readily apparent to those skilled in this art that various modifications, rearrangements and substitutions can be made without departing from the spirit of the invention. The scope of the invention is defined by the claims appended hereto.
The linear engaging fasteners 10 utilized to secure the automotive valve cover 14, shown in
The shank member 13 is generally illustrated in
The ribbed construction of the outer surface of the collet member and inner surface of the compression ring allow the two components to be interlocked into a coaxially aligned sub-assembly prior to assembly to a shank member. In operation, the compression ring and collet sub-assembly 50 (
In
In the event that a linear fastener must be removed, a similar instrument may be employed. One of the pistons would have a flange with flat lugs. The instrument would be placed over the compression ring and turned to engage the flat lugs and opposite force is applied to remove the compression ring from the collet member. The linear coupling is separated without placing pressure on the fastened components.
All patents and publications mentioned in this specification are indicative of the levels of those skilled in the art to which the invention pertains. All patents and publications are herein incorporated by reference to the same extent as if each individual publication was specifically and individually indicated to be incorporated by reference.
It is to be understood that while a certain form of the invention is illustrated, it is not to be limited to the specific form or arrangement herein described and shown. It will be apparent to those skilled in the art that various changes may be made without departing from the scope of the invention and the invention is not to be considered limited to what is shown and described in the specification.
One skilled in the art will readily appreciate that the present invention is well adapted to carry out the objectives and obtain the ends and advantages mentioned, as well as those inherent therein. The embodiments, methods, procedures and techniques described herein are presently representative of the preferred embodiments, are intended to be exemplary and are not intended as limitations on the scope. Changes therein and other uses will occur to those skilled in the art which are encompassed within the spirit of the invention and are defined by the scope of the appended claims. Although the invention has been described in connection with specific preferred embodiments, it should be understood that the invention as claimed should not be unduly limited to such specific embodiments. Indeed, various modifications of the described modes for carrying out the invention which are obvious to those skilled in the art are intended to be within the scope of the following claims.
Claims
1. A precise linear fastener system comprising:
- a collet member having a base end, a top end, an inner engaging surface, and an outer ribbed surface, said outer ribbed surface including at least one peak and at least one valley each extending non-helically about said outer ribbed surface, each said at least one peak and said at least one valley positioned on an independent plane that is substantially perpendicular to a central axis;
- a compression ring member having a base end, a front end, an inner ribbed surface complementary to said at least one peak and said at least one valley of said outer ribbed surface of said collet member, and an outer surface positioned about said central axis;
- said inner ribbed surface of said compression ring member being constructed and arranged for coaxial alignment and overlapping engagement with respect to said outer ribbed surface of said collet member, said compression ring member linearly traversable with respect to said outer ribbed surface of said collet member between a first release position and a second engaged position, wherein said engaged position results in said outer ribbed surface of said collet member and said inner ribbed surface of said compression ring compressing said collet member and tensilely loading said compression ring member which is adapted to engage a shank member having an outer gripping surface and wherein said release position results in said at least one peak of said collet member being disposed in said at least one valley of said compression ring for expansion of said collet member which is thereby adapted to release said outer gripping surface of a shank member.
2. The precise linear fastener system of claim 1 wherein said shank member includes a first end and a second end.
3. The precise linear fastener system of claim 1 wherein said ribbed outer surface of said collet member includes at least one outwardly and circumferentially extending rib, each said rib including a first ramp surface to facilitate coaxially aligned linear overlapping movement of said compression ring in relation to said collet member for engagement thereof, and a second ramp surface to facilitate linear removal of said compression ring from said collet member.
4. The precise linear fastener system of claim 1 wherein said inner engaging surface of said collet member is constructed and arranged with a conjugate shape in relation to said outer gripping surface of said shank member.
5. The precise linear fastener system of claim 1 wherein said inner engaging surface of said collet member is constructed and arranged with internal threads.
6. The precise linear fastener system of claim 1 wherein said first end of said shank member includes a tensioning means, said tensioning means being constructed and arranged to allow said shank member to be tensilely loaded prior to linear traversal of said compression ring member into said engagement position with respect to said collet member.
7. The precise linear fastener system of claim 6 wherein said shank member tensioning means includes at least one internal bore extending inwardly from said first end of said shank member along the longitudinal centerline of said shank member, wherein said at least one internal bore is constructed and arranged for gripping and placing a tensile load on said shank member prior to linear traversal of said compression ring member into said engagement position with respect to said collet member.
8. The precise linear fastener system of claim 1 wherein said outer ribbed surface of said coller member and said inner ribbed surface of said compression ring member are constructed and arranged to maintain an axially aligned interfitting relationship in said release position.
9. The precise linear fastener system of claim 1 wherein said collet member is constructed of plastic.
10. The precise linear fastener system of claim 1 wherein said collet member is constructed of copper.
11. The precise linear fastener system of claim 1 wherein said collet member is constructed of brass.
12. The precise linear fastener system of claim 1 wherein said collet member is constructed of bronze.
13. The precise linear fastener system of claim 1 wherein said collet member is constructed of aluminum.
14. The precise linear fastener system of claim 1 wherein said collet member is constructed of steel.
15. The precise linear fastener system of claim 1 wherein said collet member is constructed of rubber.
16. A precise linear fastener system comprising:
- a collet member having a base end, a top end, an inner engaging surface, and an outer ribbed surface positioned about a central axis, said outer ribbed surface including at least one peak and at least one valley, each of said at least one peak and said at least one valley constructed and arranged to extend non-helically around said outer ribbed surface each on an independent plane that is substantially perpendicular to said central axis; and
- a compression ring member having a base end, a front end, an inner ribbed surface defining peaks and valleys having the same shape as the peaks and valleys of said outer ribbed surface so as to be complementary to said peaks and valleys of said outer ribbed surface of said collet member, and an outer surface positioned about a central axis;
- said inner ribbed surface of said compression ring member being constructed and arranged for coaxial alignment and overlapping engagement with respect to said outer ribbed surface of said collet member, said compression ring member linearly traversable with respect to said outer ribbed surface of said collet member between a first release position and a second engaged position, wherein said engaged position results in said outer ribbed surface of said collet member and said inner ribbed surface of said compression ring compressing said collet member and tensilely loading said compression ring member to engage a shank member having an outer gripping surface whereby said collet member is clamped to the shank member, and wherein said release position results in said peaks of said collet member being entirely disposed in said valleys of said compression ring for expansion of said collet member thereby releasing the outer gripping surface of the shank member;
- wherein said first end of said shank member includes a tensioning means, said tensioning means being constructed and arranged to allow said shank member to be tensilely loaded prior to linear traversal of said compression ring member into said engagement position with respect to said collet member;
- wherein said shank member tensioning means includes at least one internal bore extending inwardly from said first end of said shank member along the longitudinal centerline of said shank member, wherein said at least one internal bore is constructed and arranged for gripping and placing a tensile load on said shank member prior to linear traversal of said compression ring member into said engagement position with respect to said collet member; and
- wherein said internal bore includes internal threads.
17. A linear fastener system, comprising:
- a collet member including an outer ribbed surface, said outer ribbed surface including at least one peak and at least one valley, each of said at least one peak and said at least one valley constructed and arranged to extend non-helically around said outer ribbed surface each on an independent plane that is substantially perpendicular to said central axis, and an inner surface adapted to grip a corresponding surface of a shank in a locked condition of said fastener system; and
- a compression ring including an inner ribbed surface defining at least one peak and at least one valley corresponding to said at least one peak and valley of said collet member;
- the linear fastener system having a locked condition wherein said at least one peak of said collet member and said at least one peak of said compression ring are in confronting alignment, and an unlocked condition wherein said at least one peak of said collet member disposed in said at least one valley of said compression ring, whereby said collet member is adapted to grip a shank in said locked condition without rotating said collet member.
18. A precise linear fastener system comprising:
- a collet member having opposite first ends with a shank receiving first bore at least partially defined by an inner shank engaging surface, said collet member also including a outer first surface with at least one outwardly extending first rib and at least one first groove facing generally outwardly, said collet member having a longitudinal central axis, said at least one first rib extending about said outer surface non-helically and at least one said first rib and at least one said first groove extending about said first surface each in an independent plane substantially perpendicular to said central axis; and
- a compression ring member having opposite second ends and a collet member receiving second bore defined by a collet member engaging inner second surface, said second surface including at least one inwardly extending second rib and at least one second groove facing generally inwardly, at least one of the first and second ribs being selectively receivable in a respective said second or first groove in a release position and at least one said first rib and a respective at least one said second rib being in confronting alignment in a lock position effecting radial compression of the collet member and tensile loading of the compression member to effect engagement of the inner shank engaging surface with a shank.
19. The precise linear fastener system of claim 18 wherein the first bore is a thru bore.
20. The precise linear fastener system of claim 18 wherein the second bore is a thru bore.
21. The precise linear fastener system of claim 18 including a shank member positioned in the first bore.
22. The precise linear fastener system of claim 21 wherein a first end of said shank member includes a tensioning means, said tensioning means being constructed and arranged to allow said shank member to be tensilely loaded prior to linear traversal of said compression ring member into said lock position.
23. The precise linear fastener system of claim 18 wherein said first surface of said collet member including a first ramp surface extending between an adjacent said rib and said groove to facilitate coaxially aligned linear overlapping movement of said compression ring relative to said collet member between the release position and the lock position.
24. The precise linear fastener system of claim 18 wherein said inner shank engaging surface of said collet member being constructed and arranged with internal threads.
25. The precise linear fastener system of claim 18 wherein there being a plurality of said first ribs and a plurality of said second ribs.
26. A precise linear fastener system comprising:
- a collet member with a shank receiving first bore lying along a longitudinal central axis of the collet member and including an outer ribbed first surface with at least one outwardly and circumferentially extending first rib and at least one outwardly opening and circumferentially extending first groove, said at least one first rib and first groove extending non-helically around the first surface each in an independent plane generally perpendicular to said central axis, said first bore being at least partially defined by a shank engaging surface;
- a compression ring including an inner ribbed surface at least partially defining a second bore, said collet member being at least partially received in said second bore, said second bore having an inner ribbed second surface having at least one second rib and at least one second groove whereby when the first and second ribs are in interfering contact, said collet member being radially compressed to provide a locked position and when not in interfering contact providing a release position; and
- a shank positioned in the first bore and sized and shaped to be retained in the first bore by engagement with at least a portion of the shank engaging surface when the collet member and compression ring are in the locked position.
27. The precise linear fastener system of claim 26 wherein said first surface of said collet member including a first ramp surface extending between an adjacent said first rib and said first groove to facilitate coaxially aligned linear overlapping movement of said compression ring relative to said collet member between the release position and the lock position.
28. The precise linear fastener system of claim 27 wherein there being a plurality of said first ribs and a plurality of said second ribs.
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Type: Grant
Filed: Jul 9, 2003
Date of Patent: Feb 9, 2010
Patent Publication Number: 20050008448
Assignee: Ortho Innovations, LLC (Toledo, OH)
Inventors: Robert L. Doubler (Ida, MI), John E. Hammill, Sr. (Rossford, OH)
Primary Examiner: Victor Batson
Assistant Examiner: David C Reese
Attorney: McHale & Slavin, P.A.
Application Number: 10/618,689
International Classification: F16B 39/36 (20060101);